That is certainly one view. A different view (also directly reflected in public statements in the matter) can be based in the fact that the delivery of those elements was not even guaranteed and was subject to Elite Dangerous viability as a franchise to start, and with which was obviously unproven at the time. Now, given that actual delivery was not guaranteed I think it seems reasonable to expect that a date for that could not be offered either, even in rough estimate. Either way, it has always been FDEV resources, funding and risk, so also their decision.
I'm sure you're very familiar with the development video by David Braben which makes it very clear that he expects Elite Feet to be a feature. Are you suggesting he was doing a Sean and writing chequers that he couldn't cash?
I do not make any distinction in the statement for types of LEPs. Minority of LEPs is simply making reference to the fact LEP units are a minority of total units sold. LEPers have paid in advance for all future content (including space legs and atmos if they come out). Non LEPers have not and therefore "misleading" is quite a severe moot point in the discussion of accountability compared to the other offered example of NMS pre-sales and sales during launch for actually missing content.
I'm sure you didn't mean to, but the phrasing is incorrect, you're talking about a minority of the user base, not of LEPers. Whether people have been misled or not doesn't depend on whether they have paid money or not. I'm fairly sure Frontier wouldn't take the position that they can mislead potential customers because they haven't paid any money yet.